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48 Cards in this Set
- Front
- Back
When the adult of a descendant species resembles the larval form of the ancestral species, this is...
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Paedomorphosis
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Animals in the phyla are small flat aceolomate worms that are bilaterally symmetrical, triploblastic, and do not contain appendages.
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Acoelomorpha
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Most turbellarian species...
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Are freshwater predators and scavengers.
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Which of the following is NOT a function of the parenchyma of the platyhelminthes?
-Provide skeletal support -Nutrient storage -Oxygen storage -Production of gametes -Transport of materials |
Production of gametes
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Among the flatworms, when a digestive tract is present, it has...
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A single opening, the mouth.
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The free-living flatworms are classified in the class...
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Turbellaria
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What is not true of the turbellarian gastrodermis?
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It contains smooth muscle cells
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_________ are rodlike cells of the turbellarian epidermis that swell and form a protective mucous sheath.
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Rhabdites
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The _________ layer of a fluke is composed of carbohydrates and proteins and helps protect the fluke from the host's enzymes and antibodies.
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Glycocalyx
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Turbellarians glide over substrates using _________ and muscular undulations.
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Cilia
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In larger species of turbellarians, the highly branched digestive cavity partially compensates for the....
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Absence of a circulatory system.
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Among those turbellarians possessing a digestive cavity, digestion is...
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Both extracellular and intracellular.
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The osmoregulatory organs of turbellarians are called...
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Protonephridia
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The flame cell system and protonephridia of freshwater turbellarians primarily serve to remove __________ from the body.
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Excess water
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In turbellarian nervous system, neurons carrying information to the brain are ________ neurons.
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Sensory
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In turbellarians, the nervous tissue is concentrated anteriorly in clusters of neurons called...
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Ganglia
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The small subclass of flukes, __________, includes those that are primarily internal parasites of molluscs.
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Aspidogastrea
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Chemoreceptors that aid in the location of food are especially dense in the __________ of turbellarians.
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Auricles
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The simple eyespots seen in most turbellarians are called...
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Ocelli
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Asexual reproduction by fission in some turbellarians results in a chain of individuals called ____________ that later will become independent individuals.
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Zooids
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The free-swimmin larval stage of some turbellarians is called a/an...
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Muller's larva
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The members of the Class Monogenea have tissues that develop from this many germ layers.
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Three
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A continuous multinucleate layer, formed by cell fusion, is called a/an...
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Syncytium
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The epidermis of a fluke has an outer layer called the ___________, which forms are syncytium.
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Tegument
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Flukes in the subclass Digenea always have two or more...
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Hosts
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In the class Trematoda, the phenomena of producing many cercariae is known as...
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Polyembryony
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The larval stage of memebers of class Monogenea is called the...
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Oncomiracidium
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Most flukes belong to the subclass...
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Digenea
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The lidlike hatch on trematode egg is called the...
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Operculum
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The first larval stage in the life history of digenetic fluke is the...
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Miracidium
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The encysted cercaria stage of a digenetic fluke is called the...
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Metacercaria
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Blood flukes of the genus __________ are important human parasites.
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Schistosoma
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The most highly specialized class of parasites within phylum Platyhelminthes is...
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Cestoidea
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The tapeworm strobila is made of many repeated units called...
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Proglottids
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Tapeworms lack....
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A mouth and digestive tract
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The holdfast structure of a tapeworm is called the...
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Scolex
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Scolex, neck and _______ comprise the three body regionds of a tapeworm.
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Strobila
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The oldest proglottids at the end of a tapeworm are filled with eggs, and are said to be...
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Gravid
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The six-hook (hexacanth) larva that develops from the egg of the beef tapeworm is the...
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Onchosphere
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The larval stage of the beef tapeowrm that encysts in skeletal muscles is called the...
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Cysticercus
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Nemertereans differ from flatworms in that they possess....
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A complete digestive tract
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The larval stage of the broad fish tapeworm that encysts in muscle is called the...
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Pleurocercoid
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The proboscis worms belong to the phylum...
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Nemertea
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The proboscis of nemerteans is held within a sheath called the....
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Rhynchocoel
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Nemerteans differ from flatworms in that they have a complete gut and a....
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Circulatory system
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The helmet-shaped, ciliated larva of nemerteans is the....
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Pilidium
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Animals in the phyla Cycliophora live exclusively on the mouthparts of...
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Lobsters
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Which phyla is the newest phylum to be named, and to date, only includes one species?
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Cycliophora
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